222 



GEOGEAPHICAL DISTRIBUTION. 



teras, presents features of its own ; the coast of the Carohnas and 

 Georgia has likewise distinct faunal features, while Florida and the 

 West Indies have each their peculiar Acalephs, though the boundaries 

 of the distribution of many of the species, found in each of those divis- 

 ions, extend for beyond the limits we have here assigned to the regions. 

 On the Pacific side of North America, we find the great belt of the 

 Northern Pacific extending from the shores of Kamtschatka to British 

 North Amei'ica ; the inland sea behind Vancouver's Island and the main- 

 land has a characteristic fauna, and along the coast of California itself 

 still different Medusa? are found. The association of the three elements 

 mentioned above being so different at certain localities, we naturally 

 come to look upon them as centres from which the species of a fauna 

 are derived, while in reality it is only the peculiar combinations of the 

 geographical extension of each species which give the distinguishing 

 features to each locaUty. 



NORTH PACIFIC. 



SITKA, ALEUTIAN ISLANDS, BEHRING S STRAITS, KAMTSCHATKA. 



Bolina seplentrionalis Mert. 

 Janira cucumis Less. 

 Dryodora t/t(indifonnis Ag. 

 Phacellophora camtschatica Br. 

 Cyanea Postehii Br. 

 Cyanea ferruginea Esch. 

 Peliii/ia Braiitllii Aj;. 

 Pulyhd.itriclid Jiclcola Br. 

 Metanasler Merlensii Ag. 

 yEginopsis Laurentii Br. 

 Tracliynema camlsc/ialicmn A. Ag- 

 Stanmphora ^fertl!nsn Br. 

 Dipha.iia (n iV/ra-liko) 

 Sertularia (niiVfi'na-like) 

 Colulina Greenei A. Ag. 

 T/iiiiarin (//(»/a-like) 

 Bouyaiin-illia Mertensii Ag. 

 Proboscidaclyla flavicirrala Br. 



Behring's Straits. Mertens. 



Sitka. Mertens. 



Behring's .Straits. Mertens. 



Kamtschatka. Mertens. 



Sitka. Mertens. 

 Aleutian Islands ; Kamtschatka. Eschscholtz. 



Aleutian Islands. Mertens. 



Aleutian Islands. Mertens. 



Kamtschatka. ISIertens. 



Behring's Straits. Mertens. 



Kamtschatka. Mertens. 



Aleutian Islands. Mertens. 



Behring's Straits. AV. Stiinpson. 



Behring's Straits. W. Stiinpson. 



Behring's Straits. AV. Stinipson. 



Behring's Straits. AV. Stimpson. 



Behring's Straits Mertens. 



Kamtschatka. Mertens. 



GULF OF GEORGIA, W. T. 



Bolina micrnptera A. Ag. A. Agassiz. 



Pl(:uriiliriir)ii(i Bacliei A. Ag. A. Agassiz. 



Idyia cya/liina A. Ag. A. Agassiz. 



Hecccedecomma amhUjuum Br. A. Agassiz. 



Cyanea Postehii Br. A. Agassiz. 

 Tracliynema camtschatieinn A. Ag. A. Agassiz. 



Oceania i/ni/arin A. .\g. A. Agassiz. 



Crcmalosliiina flora A. Ag. A. Agassiz. 



Zygiidiirlyla rneruli'scens Br. A. Agassiz. 



JEr/uorea ciliata Esch. A. Agassiz. 



Laomedea pacijica A. Ag. A. Agassiz. 



Piilyiirchin peniciUata A. Ag. A. Agassiz. 



Ldddicra ccUularia A. Ag. A. .\gassiz. 



Oonionemus vertens A. Ag. A. Aga.ssiz. 



Milicciium genryicum A. Ag. A. Agassiz. 



Bougainvillia Mertensii Ag. A. Agassiz. 



Slomotoca atra A. Ag. A. Agas.siz. 



I'rolioscidactyla flarivirrata Br. A. Agassiz. 



Coryne rosaria A. Ag. A. Agassiz. 



Pliysiilia sp. A. Agassiz. 



Velella septentrionalis Esch. A. .Agassiz. 



Porpita sp. A. Agassiz. 



